Heat sink for a lighting fixture



FIG. 1 is a perspective view of a heat sink for a lighting fixture design;

FIG. 2 is a top view thereof;

FIG. 3 is a first side view thereof;

FIG. 4 is a second side view thereof;

FIG. 5 is a third side view thereof;

FIG. 6 is a fourth side view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the drawings illustrate portions of the heat sink for a lighting fixture that form no part of the claimed design. 

CLAIM The ornamental design for a heat sink for a lighting fixture, as shown and described. 